Curtin University Homepage
  • Library
  • Help
    • Admin

    espace - Curtin’s institutional repository

    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item
    • espace Home
    • espace
    • Curtin Research Publications
    • View Item

    Non-Destructive Assessment of Dry Matter Yield, Nutrient Content and Feeding Value of Grass Swards with Imaging Spectroscopy

    Access Status
    Fulltext not available
    Authors
    Schut, Antonius
    Hendriks, M.
    van Evert, F.
    Hoving, K.
    Stienezen, M.
    Holshof, M.
    Molema, G.
    Meuleman, J.
    Date
    2004
    Type
    Conference Paper
    
    Metadata
    Show full item record
    Citation
    Schut, A.G.T and Hendriks, M.M.W.B. and van Evert, F.K. and Hoving, I.E. and Stienezen, M.W.J. and Holshof, G. and Molema, G.J. and Meuleman, J. 2004. Non-Destructive Assessment of Dry Matter Yield, Nutrient Content and Feeding Value of Grass Swards with Imaging Spectroscopy, in DJ Muller (ed), Proceedings of the 7th International Conference on Precision Agriculture and Other Precision Resources Management, Jul 25 2004. Minnesota USA: Precision Agriculture Center.
    Source Title
    Proceedings of the 7th International Conference on Precision Agriculture and Other Precision Resources Management
    Source Conference
    Proceedings of the 7th International Conference on Precision Agriculture and Other Precision Resources Management
    School
    Department of Spatial Sciences
    URI
    http://hdl.handle.net/20.500.11937/46723
    Collection
    • Curtin Research Publications
    Abstract

    The objective of this paper was to evaluate the accuracy of imaging spectroscopy for assessment of dry matter (DM) yield, nutrient content (N, P, K) and feeding value (sugar, ash and crude fibre content, neutral detergent fibre (NDF), acid detergent fibre and lignin (ADF and ADL) and in vitro digestibility) of heterogeneous swards typical for wet peat soils and ryegrass (Lolium perenne)-dominated grass swards on sand and clay soils in a field in the Netherlands. A mobile instrument was used that measures crop reflection from 1 m distance with a 2D camera and hyperspectral image-lines, covering a spectral range from 439-1680 nm with a spatial resolution of 0.2-0.6 mm2. Images were recorded just before harvest on various dates in experiments where sward quality, N or P application and urine application varied. Nutrient contents and feeding value of harvested material were chemically determined in the laboratory. Partial least squares models were calibrated and validated using classified images for peaty and ryegrass datasets. Root mean square errors of prediction (RMSEP) for DM yield were 390 and 479 kg/ha for ryegrass swards and swards on peat, respectively. RMSEP values were between 0.25-0.33%, 0.4-0.5 g/kg and 2.7-3.0 g/kg for N, P and K, respectively. Relative errors to the mean were between 9-14% for sugar content and between 4-6% for crude fibre, NDF and ADF content and in vitro digestibility. This study confirms earlier results on mini-swards. It is concluded that imaging spectroscopy provides robust and accurate means for assessment of DM yield, nutrient content and feeding quality of standing grass in the field, under various field conditions.

    Related items

    Showing items related by title, author, creator and subject.

    • Potential of imaging spectroscopy as tool for pasture management
      Schut, Antonius; Lokhorst, C.; Hendriks, M.; Kornet, J.; Kasper, G. (2005)
      The use of imaging spectroscopy to predict the herbage mass of dry matter (DM), DM content of herbage and crude fibre, ash, total sugars and mineral (N, P, K, S, Ca, Mg, Mn, Zn and Fe) concentrations was evaluated. The ...
    • Assessment of seasonal dry-matter yield and quality of grass swards with imaging spectroscopy
      Schut, Antonius; Ketelaars, J. (2004)
      The potential of imaging spectroscopy for the assessment of seasonal dry-matter (DM) yield and sward quality was studied. Relationships between spatial heterogeneity of tiller density, light interception, ground cover and ...
    • Flexural behaviour of hybrid fibre-reinforced polymer (FRP) matrix composites
      Sudarisman (2009)
      The flexural behaviour of three different hybrid fibre-reinforced polymer (FRP) matrix composites, i.e. S2-glass/E-glass/epoxy, TR50S carbon/IM7 carbon/epoxy, and E-glass/TR50S carbon/epoxy hybrid FRP composites, has been ...
    Advanced search

    Browse

    Communities & CollectionsIssue DateAuthorTitleSubjectDocument TypeThis CollectionIssue DateAuthorTitleSubjectDocument Type

    My Account

    Admin

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Follow Curtin

    • 
    • 
    • 
    • 
    • 

    CRICOS Provider Code: 00301JABN: 99 143 842 569TEQSA: PRV12158

    Copyright | Disclaimer | Privacy statement | Accessibility

    Curtin would like to pay respect to the Aboriginal and Torres Strait Islander members of our community by acknowledging the traditional owners of the land on which the Perth campus is located, the Whadjuk people of the Nyungar Nation; and on our Kalgoorlie campus, the Wongutha people of the North-Eastern Goldfields.